When the style icon designs a collection for AG the pieces sell out instantly, Mulberry credits its 'Alexa' satchel with sparking a 57% rise in the luxury brand’s sales – despite the fact that Chung wasn’t even involved in the creative process - and when the 32-year-old stepped out in a suede A-line Marks & Spencer skirt last year, the high street retailer moved 4,500 units in just six weeks.